<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <!-- 不管标签里面是什么 就是原样输出 -->
        <div v-pre>{{msg}}</div>
    </div>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.14/vue.js"></script> 
    <script>
       const app = new Vue({
           el: '#app',
           data: {
               msg: "123123123  123123123  12312312      123123132"
           }
       })
    </script>
</body>
</html>